# -*- coding: utf-8; -*-
#
# This file is part of Superdesk.
#
# Copyright 2013, 2014 Sourcefabric z.u. and contributors.
#
# For the full copyright and license information, please see the
# AUTHORS and LICENSE files distributed with this source code, or
# at https://www.sourcefabric.org/superdesk/license

import re
import hashlib
from dateutil import parser

from superdesk.errors import IngestTwitterError
from superdesk.io.registry import register_feeding_service
from superdesk.io.feeding_services import FeedingService
from superdesk.metadata.utils import generate_guid
from superdesk.metadata.item import ITEM_TYPE, CONTENT_TYPE, GUID_TAG

import twitter


class TwitterFeedingService(FeedingService):
    """
    Feeding Service class which can read feed from multiple Twitter
    Screen Names and also hashtags
    """

    NAME = "twitter"

    label = "Twitter"

    fields = [
        {
            "id": "consumer_key",
            "type": "text",
            "label": "Twitter Consumer Key",
            "placeholder": "Twitter consumer_key",
            "required": True,
            "errors": {6100: "Twitter authentication failure"},
        },
        {
            "id": "consumer_secret",
            "type": "password",
            "label": "Twitter Consumer Secret",
            "placeholder": "Twitter consumer_secret",
            "required": True,
        },
        {
            "id": "screen_names",
            "type": "text",
            "label": "Twitter Screen Names",
            "placeholder": "Twitter screen_names",
            "required": True,
            "errors": {6200: "No Screen names specified"},
        },
    ]

    ERRORS = [
        IngestTwitterError.TwitterLoginError().get_error_description(),
        IngestTwitterError.TwitterNoScreenNamesError().get_error_description(),
        IngestTwitterError.TwitterRateLimitError().get_error_description(),
        IngestTwitterError.TwitterAPIGeneralError().get_error_description(),
    ]

    def _test(self, provider):
        self._update(provider, update=None, test=True)

    def _update(self, provider, update, test=False):
        config = provider.get("config", {})
        consumer_key = config.get("consumer_key", "")
        consumer_secret = config.get("consumer_secret", "")
        screen_names = config.get("screen_names", "")
        status_count = 100
        # how many statuses to get, 200 should be max

        new_items = []
        api = twitter.Api(consumer_key=consumer_key, consumer_secret=consumer_secret, application_only_auth=True)
        try:
            screen_names = screen_names.split(",")
        except Exception as ex:
            raise IngestTwitterError.TwitterNoScreenNamesError(ex, provider)

        if not screen_names:
            raise IngestTwitterError.TwitterNoScreenNamesError(provider)
        for screen_name in screen_names:
            screen_name = screen_name.replace(" ", "")
            try:
                # hashtag search
                if screen_name.startswith("#"):
                    statuses = api.GetSearch(screen_name.lstrip("#"), count=status_count)
                # user search
                else:
                    statuses = api.GetUserTimeline(screen_name=screen_name, count=status_count)
            except twitter.error.TwitterError as exc:
                # in some case python twitter error will return dict
                if isinstance(exc.args[0], dict):
                    raise IngestTwitterError.TwitterAPIGeneralError(exc, provider)
                if exc.message[0].get("code") == 34:
                    # that page does not exist
                    continue
                elif exc.message[0].get("code") == 32:
                    # invalid credentials
                    raise IngestTwitterError.TwitterLoginError(exc, provider)
                elif exc.message[0].get("code") == 88:
                    # rate limit exceeded
                    raise IngestTwitterError.TwitterRateLimitError(exc, provider)
                else:
                    raise IngestTwitterError.TwitterAPIGeneralError(exc, provider)

            for status in statuses:
                d = parser.parse(status.created_at)
                guid_hash = hashlib.sha1(status.text.encode("utf8")).hexdigest()
                guid = generate_guid(type=GUID_TAG, id=guid_hash)
                headline = "%s: %s" % (status.user.screen_name, status.text)
                item = {}
                item["source"] = "twitter"
                item["extra"] = {"tweet_url": "https://twitter.com/%s/status/%s" % (status.user.screen_name, status.id)}
                item["headline"] = headline
                item["type"] = "text"
                item["guid"] = guid
                item["versioncreated"] = d
                item["firstcreated"] = d

                item["body_html"] = status.text
                # include URL on body
                urls = re.findall(
                    "http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|" "[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+", status.text
                )
                if urls:
                    item["body_html"] += '<p><a href="%s"' ' target="_blank">%s</a></p>' % (urls[0], urls[0])

                # on hashtag search we don't want retweets
                if not (screen_name.startswith("#") and status.text.startswith("RT ")):
                    new_items.append(item)
                    if status.media:
                        image_urls = []
                        for media_item in status.media:
                            if media_item.type in ["photo", "animated", "video"]:
                                image_urls.append(media_item.media_url)
                        try:
                            # Eg can fail while fetching image
                            image_items = self._create_image_items(image_urls, item)
                            new_items.extend(image_items)
                            package_item = self._create_package(item, image_items)
                            new_items.append(package_item)
                        except Exception:
                            pass
        return [new_items]

    def _create_package(self, text_item, image_items):
        """
        Create a new content package from given content items.
        """
        package = {
            ITEM_TYPE: CONTENT_TYPE.COMPOSITE,
            "guid": generate_guid(type=GUID_TAG, id=text_item.get("guid") + "-package"),
            "versioncreated": text_item["versioncreated"],
            "firstcreated": text_item.get("firstcreated"),
            "headline": text_item.get("headline", ""),
            "groups": [
                {
                    "id": "root",
                    "role": "grpRole:NEP",
                    "refs": [{"idRef": "main"}],
                },
                {
                    "id": "main",
                    "role": "main",
                    "refs": [],
                },
            ],
        }

        item_references = package["groups"][1]["refs"]
        item_references.append({"residRef": text_item["guid"]})

        for image in image_items:
            item_references.append({"residRef": image["guid"]})

        return package

    def _create_image_items(self, image_links, text_item):
        image_items = []

        for image_url in image_links:
            guid_hash = hashlib.sha1(image_url.encode("utf8")).hexdigest()
            img_item = {
                "guid": generate_guid(type=GUID_TAG, id=text_item.get("guid") + guid_hash + "-image"),
                ITEM_TYPE: CONTENT_TYPE.PICTURE,
                "versioncreated": text_item.get("versioncreated"),
                "firstcreated": text_item.get("firstcreated"),
                "headline": text_item.get("headline", ""),
                "renditions": {"baseImage": {"href": image_url}},
            }
            image_items.append(img_item)

        return image_items


register_feeding_service(TwitterFeedingService)
